Opto-Electronics


LED driver has no need for µC or converter

20 September 2006 Opto-Electronics

The MAX16806 is the first linear LED driver that controls total power dissipation in a lighting system, according to the manufacturer, Maxim. It eliminates the need for a switch-mode driver by folding back the LED current at high-input voltage or high ambient temperature. The 200 Hz ramp on-board allows analog control of PWM dimming, eliminating the need for a μC PWM signal. It employs a unique approach to ensure consistent product brightness. An EEPROM-programmable current-sense reference eliminates the need for a complex matrix of sense resistors to match each LED bin in production. Using only one of the sense resistor's values and the I²C interface, the LED current will be programmed at the production line, based on the LED bin information. The device requires minimum external components to implement the LED driver circuit in automotive dome and map-lighting applications. It is said to be a cost-effective lighting solution for applications that would usually require a switch-mode LED driver or many discrete components. Additionally its use in these applications eliminates EMI concerns - usually caused by switch-mode converters. The MAX16806/5 are rated for -40 to 125°C and come in SMT, 5 x 5 mm, 20-pin TQFN lead-free packages.



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